Damper



Jan. 6,' 1931. w. B. sl'ruR'Gls DAMPER File@ July 2. 1928 ,UQ @sa PassedJan. 6,1931' UNITED STATES WILLIAM B. STURGIS, OF CHICAGO, ILLINOIS manApplication 1ed-J'u1y2, 1928.` Serial No. 269,748.

The present invention relates generally to automatic draft regulatingdevices for maintaining a uniform or constant draft in the flue oroutlet conduit of a heating apparatus by automatically regulating theentry of air into such flue in response to variations or uctuations inthe pressure of the escaping gases and products of combustion." Moreparticu? larly the invention' relates to that `type of draft' regulatingdevice which embodies a counterbalanced damper plate which is positionedadjacent to one end of a horizontally extending air inlet pipe .orpassageway and is mounted to swing on a xed horizontal axis which isdisposed eccentrically with respect to the damper plate and the inletpipe. One object ofthe invention is to provide a draft regulating orvdamper device of the aforementioned type which, is generally of animproved character and may be adjusted readily to maintain a draft ofthe desired intensity.

Another object of the invention is to provide a damper device which isso constructed that it operates in an extremely efficient manner and mabe produced at a low cost. Other obJects of the invention and thevarious advantages and characteristics of the present damperconstruction willbe apparent from a consideration of the followingdetailed description. v

The invention consists inthe several novel features hereinafter setforth and more par ticularly defined by claimsl at the conclusionhereof.-

In the -drawings which accompany and form apart of this specification ordisclosure and in ywhich like numerals of reference denotevcorresponding parts throughout the several views t l K Fig. 1 is apartially .sectioned side view of the damper, when not affected by adraft;

Fig. 2 is a front view of the damper;

Fig. 3is a fragmentary-view'corresponding to a portion of Fi 1, showingtheaction of thedamper under t efdaft for which set;

Fig. 4 is a similar view, showing the acxtion ofthe damper under anincrease in the I draft; and

I1`igs.v 5, 6 and 7 are 'views corresponding to Figs. 1, 3 and 4, withthe damper set for a lighter draft, Fig. 5 showing the damper` when notaffected by a draft, Fig. 6 showing the action of the damper under thedraft for which set, and Fig. 7 showing the action ofl the damper underan increase inthe draft.` The damper device shown in the drawing isincorporated in the cylindrical part 10 of a T-shaped pipe section 11,and consists of a circular plate 12 which is of such size as to closeoff the passageway in the part 10. The plate 12 is pivotally mounted inthe part 10 on a horizontal rod 13. The rod 13 engages frictionally instraps 14 secured to the back of the plate, and is journaled freely atthe edges of the plate in apertures 15 in the part 10. The rod 13 isplaced below the center of the passageway in the part 1,0and engageswith the plate 12 below the center of the latter. A sto portion of the pate 12 and has an offset downwardly extending portion which is adaptedto engage with the lower edge of the part 10 when the plate 12 is in theposition Y.of the damper is adjustably counterbalanced..

ATo set the damper to give a moderate, draft, the stop 16 is heldagainst the lower edge of the part 10 and the handle portion 17 oftherod 13 is swung against the frictional resistance offered by the straps14C into the parallel position shown in Fig. 1. The suction from thecurrent of air passing upwardly within the pipe section 11 will swingthe plate 12 into the position shown in Fig. 3, since the area of theplate above the pivot rod 13'is greater than the area of the plate belowthe rod. Should the draft for any reason increase beyond that desiredfor the oil burneror other heat-ing plant with which the damper isassociated, the resulting additional suction on the upper portion of theplate 12 will swingthe same into the position shown in Fig. 4, therebypermitting an increased iow of'air into tliepipe section through thepassageway in the part 10 to 16 is secured to the lower f counteract andcompensate for the increased draft in the pipe section. Should a lighterdraft be desired, the stop 16 is held and the handle port-ion 17 of therod 13 is swung into an angular positionv with respect to the plate.

- affecting the same, into the position shown in Fig. 5. Under the draftdesired, the plate l 12 will swing into the position shown in Fig.

6 to permit `a small counteracting current of air to enter the pipesection through the passageway in the part 10, and, under an increase inthe draft, the plate will swing into the position shown in Fig. 7

Should a draft heavier than that provided for in either the settingshown in Fig. 1 or the setting shown in Fig. 5 be desired, the stop 16is held and the handle portion 17 of the rod 13 is swung into an angularposition on the opposite` side of the lower portion of the plate fromthat shown in F ig. 5, thus considerably over-balancing theupper'portion of the plate.

The handle portion 17 of the'rod '13 will stay in any angular positionin which (placed with respect to the Jplate 12, and an esired draftadjustment may be easily e ected by changing the relative positionofthehandle portion 17.

I claim: 1. In an automatic damper device,- a T- shaped ipe section, aclosure plate positioned' in the orizontal passageway of said ipesection, andV a horizontal rod journaleg in said pipe section and enaging frictionally with said closure plate eneath the center of thelatter, said rod having a downwardly I extendin counter-balancingportion for angular adjustment with respect to said plate.

2. In an'automatic damperl device, the combination of a pipe-sectionhaving a horizontal passageway, a late for controlling the flow of vairthrong -said passageway, said plate being pivoted beneath its center andso as to swing on a substantiallyhorizont/al axis, a lug connected tothe bottom part/'of said plate and adapted to limit swinging movement ofthe plate in one direction, and a member operab e in conjunction withthe lug to counter-balance the plate, said mmber being mounted so'thatit may be shifted from one side of the plate to the other for draftadjusting purposes.

3. In an automatic damper device, the combination of a pipe-sectionhaving a horizontal passa eway, a damper plate vfor controlling the owof air through the passageway,

a horizontal rod extending across the pas- .sageway and operating as aneccentric pivotal support for the plate, and a counterweight memberconnected to the 'rod and shiftable from one side of the plate to theother for draft adjusting purposes.

v4. In an automatic damper device, the combination of a pipe-section, aplate for controlling the flow of air through/the pipe-section, and arod journalled in t e pipe section and operating as a pivotal mount forthe plate, said rod embodying a transversely extending arm at one endthereof and being loosely connected to the plate so that the arm may beswung into different 'angular positions for draft adjusting purposes.

5. In an automatic damper device, the combination of a pipe sectionhaving a horizontal passageway, a plate for controlling the flow of airthrough said passageway, a support whereby the plate is pivotedeccentrically and so as to swing on a substantially horizontal axis, alug connected to the smaller of the two parts of the plate that are atopposite sides of the pivotal support and adapted to limit swingingmovement of the late in one direction, and a. member operab e inconjunction with the lug. to counterbalance the plate, said member beingmounted so that it may be shifted from one ,side'of the plate to theother for draft adjusting vpur oses.

6. In an automatic damper device,t e combination .of a `pipe sectionhaving a horizontal passageway, a plate for controlling the -flow of airthrough said passageway, a horizontal rod extending across thelpassageway Ia .member operab e iny conjunction with the lu tocounter-balance the plate, said member being connected-to the rod andshiftable into different positions for draft regulating purposes. .y

7 In an automatic damper device, the combination of a pipe sectionhavinghslhorizontal passageway, a plate for contro g the flow of airthrough said passageway, a support whereby the plate is pivotedeccentrically and so as to swing on a substantially horizontal axis, alug connected to the smallerof the two parts of the plate at oplpglsitesides of the support and adapted to 't swinging movement of the late inone direction, and a member operabll in conjunction with the li to.counterbalance the plate, said member bem mounted so that it may beswungto poses. i

8. In an automatic damper device, the combination of'a pipe sectionhaving a horizonf tal passageway, a late for controlling the ilow of airthrong said pway, said plate being pivoted eccentrically and to swing ona'substantially horizontal axis and being adapted, when 1n its verticalposition, to' ,close completelylghe passageway, and a eounterweight memr for the plate, mounted so that it may be swung-to and from-said platevfor draft adjusting purposes.

9. In an automatic damper devie, tlie combination of a pipe sectionhaving a horizontal passageway, a plate for controlling the dow of airthrou h said passageway, said plate bein pivote eccentrlcally and toswing on a sustantially horizontal axis and being adapted, when in itsvertical position, to close lcompletely the passageway, and acounterweight arm connected to the plate so that it may be swung-fromone face of the plate to the other for draft adjusting purposes.

In testimony whereof I have hereunto subscribed my name.

Lamas

